Definition of mailbox in The Network Encyclopedia.

What is Mailbox?

In Microsoft Exchange Server, a receptacle for messages sent by other users. Mailboxes are the most common type of Exchange recipient and are usually associated with the Microsoft Windows NT or Windows 2000 account of a user in the company’s network.

Mailboxes store the user’s folders, messages, and attachments in the private information store on an Exchange server. The mailbox content for each user in an organization using Exchange exists on only one server in the organization, which is called the user’s home server.


To change the properties of a large group of mailboxes simultaneously, choose Directory Export from the Exchange Administrator (or its command-line equivalent) to export the properties of the mailboxes to a .csv text file. Edit the file to change the properties using the Replace feature of your text editor, and then choose Directory Import from the menu to import the properties back into the Exchange directory.

If you need to create a large number of similar mailboxes, first create a mailbox template, and then choose Duplicate from the Exchange Administrator.